S 795-013
(15)
Examine all of the joints in the tubes for reservoir pressurization, between the pneumatic duct and the reservoir, for leaks.
(16)
Repair the cause of all leaks.
S 665-059
NOTE: A cap is in the tube for reservoir pressurization, near the
____ forward end of the diagonal brace. This cap has a hole which drains fluids. Do not seal this cap.
S 865-014
(17)
Remove the pressure from the pneumatic system (AMM 36-00-00/201).
S 865-015
(18)
Open the bleed valve on the reservoir pressurization module to remove the pressure from the reservoir (AMM 29-11-00/201).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
29-17-00
ALL ú ú 02 Page 503 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 865-016
(19)
Open these circuit breakers and attach DO-NOT-CLOSE tags. Do not open the applicable circuit breaker for the hydraulic system on which you do the test.
(a)
P7 Overhead Circuit Breaker Panel
1) 7F03 HYDRAULICS HYDIM 1
2) 7G03 HYDRAULICS HYDIM 2
3) 7H03 HYDRAULICS HYDIM 3
4) 7J03 HYDRAULICS HYDIM 4
S 485-017
(20)
Connect an air source to the port T on the reservoir pressurization module.
S 865-036
(21)
Slowly pressurize the reservoir pressurization module until you can hear the flow of air from the vent line of the reservoir relief valve.
NOTE: Do not increase the pressure of the air source to more than
____
75 psig.
S 215-037
(22)
Make sure the indication on the pressure gage becomes stable between 60 and 65 psig.
(23)
Slowly decrease the pressure of the air source to 52-54 psig.
S 215-039
(24)
Make sure the pressure at which the flow of air stops is between 52 and 54 psig.
S 865-038
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
29-17-00
ALL ú ú 01 Page 504 ú Oct 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 865-040
(25)
Close the valve in the air supply.
S 975-041
(26)
Make a record of the indication on the pressure gage.
S 215-042
(27)
Monitor the indication on the pressure gage for five minutes.
S 975-043
(28)
Make a record of the pressure after five minutes.
S 975-044
(29)
Make sure the indication on the pressure gage did not decrease more than one psig during the five minutes.
S 215-045
(30)
Monitor the EICAS SYNOPTIC PAGE (29 HYD) and the pressure gage on the reservoir pressurization module.
S 865-046
(31)
Operate the bleed valve on the reservoir pressurization module to slowly decrease the reservoir pressure to 5-10 psig.
S 975-047
(32)
Make a record of the pressure at which the EICAS message, RSVR PRESS, shows on the synoptic page.
S 865-048
(33)
Slowly increase the pressure of the air source.
S 975-049
(34)
Make a record of the pressure at which the EICAS message, RSVR PRESS, does not show on the synoptic page.
S 975-050
(35)
Calculate the difference in the pressure at which the EICAS message, RSVR PRESS, shows and does not show.
(36)
Make sure the pressure difference is not more than 7 psig.
(37)
Close the valve in the air supply.
S 865-025
(38)
Open the bleed valve on the reservoir pressurization module to remove the pressure in the reservoir (AMM 29-11-00/201).
S 215-051
S 865-024
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：747-400 AMM 飞机维护手册 液压 HYDRAULIC 2(73)
